#!/bin/sh
# (C) 2014 Red Hat Inc. <http://www.redhat.com>
# (C) 2015 ungleich GmbH <http://www.ungleich.ch>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public
# License along with this program; if not, write to the Free
# Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301 USA


warn ()
{
   echo "$@" >&2
}

_init ()
{

    # log level definitions
    LOG_NONE=NONE;
    LOG_CRITICAL=CRITICAL;
    LOG_ERROR=ERROR;
    LOG_WARNING=WARNING;
    LOG_INFO=INFO
    LOG_DEBUG=DEBUG;
    LOG_TRACE=TRACE;

    HOST_NAME_MAX=64;

    prefix="@prefix@";
    exec_prefix=@exec_prefix@;
    cmd_line=$(echo "@sbindir@/glusterfs");

    alias lsL='ls -L'
    uname_s=`uname -s`
    case ${uname_s} in
        Darwin)
            getinode="stat -f %i"
            getdev="stat -f %d"
            ;;
    esac
}

is_valid_hostname ()
{
    local server=$1

    length=$(echo $server | wc -c)
    if [ ${length} -gt ${HOST_NAME_MAX} ]; then
        return 1
    fi
}

parse_backup_volfile_servers ()
{
    local server_list=$1
    local servers=""
    local new_servers=""

    servers=$(echo ${server_list} | sed 's/\:/ /g')
    for server in ${servers}; do
        is_valid_hostname ${server}
        if [ $? -eq 1 ]; then
            continue
        fi
        new_servers=$(echo "${new_servers} ${server}")
    done

    echo ${new_servers}
}

parse_volfile_servers ()
{
    local server_list=$1
    local servers=""
    local new_servers=""

    servers=$(echo ${server_list} | sed 's/,/ /g')
    for server in ${servers}; do
        is_valid_hostname ${server}
        if [ $? -eq 1 ]; then
            continue
        fi
        new_servers=$(echo "${new_servers} ${server}")
    done

    echo ${new_servers}
}

start_glusterfs ()
{
    if [ -n "$log_level_str" ]; then
        case "$( echo $log_level_str | awk '{print toupper($0)}')" in
            "ERROR")
                log_level=$LOG_ERROR;
                ;;
            "INFO")
                log_level=$LOG_INFO;
                ;;
            "DEBUG")
                log_level=$LOG_DEBUG;
                ;;
            "CRITICAL")
                log_level=$LOG_CRITICAL;
                ;;
            "WARNING")
                log_level=$LOG_WARNING;
                ;;
            "TRACE")
                log_level=$LOG_TRACE;
                ;;
            "NONE")
                log_level=$LOG_NONE;
                ;;
            *)
                warn "invalid log level $log_level_str, using INFO";
                log_level=$LOG_INFO;
                ;;
        esac
    fi

    # options without values start here
    if [ -n "$read_only" ]; then
        cmd_line=$(echo "$cmd_line --read-only");
    fi

    if [ -n "$acl" ]; then
        cmd_line=$(echo "$cmd_line --acl");
    fi

    if [ -n "$selinux" ]; then
         cmd_line=$(echo "$cmd_line --selinux");
    fi

    if [ -n "$enable_ino32" ]; then
        cmd_line=$(echo "$cmd_line --enable-ino32");
    fi

    if [ -n "$worm" ]; then
        cmd_line=$(echo "$cmd_line --worm");
    fi
    if [ -n "$volfile_max_fetch_attempts" ]; then
       cmd_line=$(echo "$cmd_line --volfile-max-fetch-attempts=$volfile_max_fetch_attempts")
    fi

    if [ -n "$fopen_keep_cache" ]; then
        cmd_line=$(echo "$cmd_line --fopen-keep-cache");
    fi

    if [ -n "$volfile_check" ]; then
        cmd_line=$(echo "$cmd_line --volfile-check");
    fi

    if [ -n "$mem_accounting" ]; then
        cmd_line=$(echo "$cmd_line --mem-accounting");
    fi

    if [ -n "$aux_gfid_mount" ]; then
        cmd_line=$(echo "$cmd_line --aux-gfid-mount");
    fi

    if [ -n "$no_root_squash" ]; then
        cmd_line=$(echo "$cmd_line --no-root-squash");
    fi

    if [ -n "$capability" ]; then
         cmd_line=$(echo "$cmd_line --capability");
    fi

#options with values start here
    if [ -n "$log_level" ]; then
        cmd_line=$(echo "$cmd_line --log-level=$log_level");
    fi

    if [ -n "$log_file" ]; then
        cmd_line=$(echo "$cmd_line --log-file=$log_file");
    fi

    if [ -n "$direct_io_mode" ]; then
        cmd_line=$(echo "$cmd_line --direct-io-mode=$direct_io_mode");
    fi

    if [ -n "$mac_compat" ]; then
        cmd_line=$(echo "$cmd_line --mac-compat=$mac_compat");
    fi

    if [ -n "$use_readdirp" ]; then
        cmd_line=$(echo "$cmd_line --use-readdirp=$use_readdirp");
    fi

    if [ -n "$volume_name" ]; then
        cmd_line=$(echo "$cmd_line --volume-name=$volume_name");
    fi

    if [ -n "$attribute_timeout" ]; then
        cmd_line=$(echo "$cmd_line --attribute-timeout=$attribute_timeout");
    fi

    if [ -n "$entry_timeout" ]; then
        cmd_line=$(echo "$cmd_line --entry-timeout=$entry_timeout");
    fi

    if [ -n "$negative_timeout" ]; then
        cmd_line=$(echo "$cmd_line --negative-timeout=$negative_timeout");
    fi

    if [ -n "$gid_timeout" ]; then
        cmd_line=$(echo "$cmd_line --gid-timeout=$gid_timeout");
    fi

    if [ -n "$bg_qlen" ]; then
        cmd_line=$(echo "$cmd_line --background-qlen=$bg_qlen");
    fi

    if [ -n "$cong_threshold" ]; then
        cmd_line=$(echo "$cmd_line --congestion-threshold=$cong_threshold");
    fi

    if [ -n "$fuse_mountopts" ]; then
        cmd_line=$(echo "$cmd_line --fuse-mountopts=$fuse_mountopts");
    fi

    if [ -n "$xlator_option" ]; then
        cmd_line=$(echo "$cmd_line --xlator-option=$xlator_option");
    fi

    if [ -n "$process_name" ]; then
        cmd_line=$(echo "$cmd_line --process-name fuse.$process_name");
    else
        cmd_line=$(echo "$cmd_line --process-name fuse");
    fi

    if [ -z "$volfile_loc" ]; then
        if  [ -n "$server_ip" ]; then

            servers=$(parse_volfile_servers ${server_ip});
            if [ -n "$servers" ]; then
                for i in $(echo ${servers}); do
                    cmd_line=$(echo "$cmd_line --volfile-server=$i");
                done
            else
                warn "ERROR: No valid servers found on command line.. exiting"
                print_usage
                exit 1
            fi

            if [ -n "$backupvolfile_server" ]; then
                if [ -z "$backup_volfile_servers" ]; then
                    is_valid_hostname ${backupvolfile_server};
                    if [ $? -eq 1 ]; then
                        warn "ERROR: Invalid backup server specified.. exiting"
                        exit 1
                    fi
                    cmd_line=$(echo "$cmd_line --volfile-server=$backupvolfile_server");
                fi
            fi

            if [ -n "$backup_volfile_servers" ]; then
                backup_servers=$(parse_backup_volfile_servers ${backup_volfile_servers})
                for i in $(echo ${backup_servers}); do
                    cmd_line=$(echo "$cmd_line --volfile-server=$i");
                done
            fi

            if [ -n "$server_port" ]; then
                cmd_line=$(echo "$cmd_line --volfile-server-port=$server_port");
            fi

            if [ -n "$transport" ]; then
                cmd_line=$(echo "$cmd_line --volfile-server-transport=$transport");
            fi

            if [ -n "$volume_id" ]; then
                cmd_line=$(echo "$cmd_line --volfile-id=$volume_id");
            fi
        fi
    else
        cmd_line=$(echo "$cmd_line --volfile=$volfile_loc");
    fi

    if [ -n "$fuse_mountopts" ]; then
        cmd_line=$(echo "$cmd_line --fuse-mountopts=$fuse_mountopts");
    fi

    cmd_line=$(echo "$cmd_line $mount_point");
    $cmd_line;

    if [ $? -ne 0 ]; then
        exit 1;
    fi
}

print_usage ()
{
cat << EOF >&2
Usage: $0 <volumeserver>:<volumeid/volumeport> -o<options> <mountpoint>
Options:
man 8 $0
To display the version number of the mount helper: $0 -V
EOF
}

with_options()
{
    local key=$1
    local value=$2

    # Handle options with values.
    case "$key" in
        "log-level")
            log_level_str=$value
            ;;
        "log-file")
            log_file=$value
            ;;
        "transport")
            transport=$value
            ;;
        "direct-io-mode")
            direct_io_mode=$value
            ;;
        "mac-compat")
            mac_compat=$value
            ;;
        "volume-name")
            volume_name=$value
            ;;
        "volume-id")
            volume_id=$value
            ;;
        "volfile-check")
            volfile_check=$value
            ;;
        "server-port")
            server_port=$value
            ;;
        "attribute-timeout")
            attribute_timeout=$value
            ;;
        "entry-timeout")
            entry_timeout=$value
            ;;
        "negative-timeout")
            negative_timeout=$value
            ;;
        "gid-timeout")
            gid_timeout=$value
            ;;
        "background-qlen")
            bg_qlen=$value
            ;;
        "backup-volfile-servers")
            backup_volfile_servers=$value
            ;;
        "backupvolfile-server")
            backupvolfile_server=$value
            ;;
        "fetch-attempts")
            volfile_max_fetch_attempts=$value
            ;;
        "congestion-threshold")
            cong_threshold=$value
            ;;
        "xlator-option")
            xlator_option=$value
            ;;
        "fuse-mountopts")
            fuse_mountopts=$value
            ;;
        "use-readdirp")
            use_readdirp=$value
            ;;
        "no-root-squash")
            if [ $value = "yes" ] ||
                [ $value = "on" ] ||
                [ $value = "enable" ] ||
                [ $value = "true" ] ; then
                no_root_squash=1;
            fi ;;
        "root-squash")
            if [ $value = "no" ] ||
                [ $value = "off" ] ||
                [ $value = "disable" ] ||
                [ $value = "false" ] ; then
                no_root_squash=1;
            fi ;;
        "process-name")
            process_name=$value
            ;;
        *)
            warn "Invalid option: $key"
            exit 1
            ;;
    esac
}

without_options()
{
    local option=$1
    # Handle options without values.
    case "$option" in
        "ro")
            read_only=1
            ;;
        "acl")
            acl=1
            ;;
        "selinux")
            selinux=1
            ;;
        "worm")
            worm=1
            ;;
        "fopen-keep-cache")
            fopen_keep_cache=1
            ;;
        "enable-ino32")
            enable_ino32=1
            ;;
        "mem-accounting")
            mem_accounting=1
            ;;
        "aux-gfid-mount")
            if [ ${uname_s} = "Linux" ]; then
                aux_gfid_mount=1
            fi
            ;;
         # "mount -t glusterfs" sends this, but it's useless.
        "rw")
            ;;
         # these ones are interpreted during system initialization
        "noauto")
            ;;
        "_netdev")
            ;;
        "capability")
            capability=1
            ;;
        *)
            warn "Invalid option $option";
            exit 1
            ;;
    esac
}

parse_options()
{
    local optarg=${1}
    for pair in $(echo $optarg | sed 's/,/ /g'); do
        key=$(echo "$pair" | cut -f1 -d'=');
        value=$(echo "$pair" | cut -f2- -d'=');
        if [ "$key" = "$value" ]; then
            without_options $pair;
        else
            with_options $key $value;
        fi
    done
}

main ()
{
    ## `mount` on OSX specifies options as first argument
    echo $1|grep -q -- "-o"
    if [ $? -eq 0 ];  then
        volfile_loc=$3
        mount_point=$4
    else
        volfile_loc=$1
        mount_point=$2
    fi

    while getopts "Vo:h" opt; do
        case "${opt}" in
            o)
                parse_options ${OPTARG};
                ;;
            V)
                ${cmd_line} -V;
                exit 0;
                ;;
            h)
                print_usage;
                exit 0;
                ;;
            ?)
                print_usage;
                exit 0;
                ;;
        esac
    done

    [ -r "$volfile_loc" ] || {
        # '%' included to support ipv6 link local addresses
        server_ip=$(echo "$volfile_loc" | sed -n 's/\([a-zA-Z0-9:%.\-]*\):.*/\1/p');
        volume_str=$(echo "$volfile_loc" | sed -n 's/.*:\([^ ]*\).*/\1/p');
        [ -n "$volume_str" ] && {
            volume_id="$volume_str";
        }
        volfile_loc="";
    }

    [ -z "$volume_id" -o -z "$server_ip" ] && {
        cat <<EOF >&2
ERROR: Server name/volume name unspecified cannot proceed further..
Please specify correct format
Usage:
man 8 $0
EOF
        exit 1;
    }

    grep_ret=$(echo ${mount_point} | grep '^\-o');
    [ "x" != "x${grep_ret}" ] && {
        cat <<EOF >&2
ERROR: -o options cannot be specified in either first two arguments..
Please specify correct style
Usage:
man 8 $0
EOF
        exit 1;
    }

    # No need to do a ! -d test, it is taken care while initializing the
    # variable mount_point
    [ -z "$mount_point" -o ! -d "$mount_point" ] && {
        cat <<EOF >&2
ERROR: Mount point does not exist
Please specify a mount point
Usage:
man 8 $0
EOF
        exit 1;
    }

    start_glusterfs;
}

_init "$@" && main "$@";
